Their idea of decent is a dream for a good chunk of the world population. We're the privileged ones. People kill to live like us.

well then you'll enjoy thinking about how most people on earth don't meet that standard, so maybe it's time we give up some of our luxuries so the rest of planet earth can stop living in abject suffering?

ITT: people who didn't even glance at the study.

Quoting from the study:

"It is important to understand that the DLS represents a minimum floor for decent living. It does not represent a an aspirational standard and certainly does not represent a ceiling. However, it is also a level of welfare not currently achieved by the vast majority of people. A new paper by Hoffman et al finds that 96.5 percent of people in low- and middle-income countries are deprived of at least one DLS dimension...we can conclude that 6.4 billion people, more than 80% of the world's population, are deprived of DLS."

The authors are not suggesting that everyone be forced on DLS at gunpoint. They are suggesting an absolute bare minimum standard that the overwhelming majority of people on Earth do not yet even have. Quite obviously any excess production could and would be used to increase standard of living.